1
CBSE 12th Math (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+1
-0
If $${({x^2} + {y^2})^2} = xy$$, then $${{dy} \over {dx}}$$ is
A
$${{y + 4x({x^2} + {y^2})} \over {4y({x^2} + {y^2}) - x}}$$
B
$${{y - 4x({x^2} + {y^2})} \over {x + 4({x^2} + {y^2})}}$$
C
$${{y - 4x({x^2} + {y^2})} \over {4y({x^2} + {y^2}) - x}}$$
D
$${{4y({x^2} + {y^2}) - x} \over {y - 4x({x^2} + {y^2})}}$$
2
CBSE 12th Math (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+1
-0
If a matrix A is both symmetric and skew symmetric, then A is necessarily a
A
Diagonal matrix
B
Zero square matrix
C
Square matrix
D
Identity matrix
3
CBSE 12th Math (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+1
-0
Let set X = {1, 2, 3} and a relation R is defined in X as : R = {(1, 3), (2, 2), (3, 2)}, then minimum ordered pairs which should be added in relation R to make it reflexive and symmetric are
A
{(1, 1), (2, 3), (1, 2)}
B
{(3, 3), (3, 1), (1, 2)}
C
{(1, 1), (3, 3), (3, 1), (2, 3)}
D
{(1, 1), (3, 3), (3, 1), (1, 2)}
4
CBSE 12th Math (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+1
-0
A Linear Programming Problem is as follows:

Minimize z = 2x + y

subject to the constraints

x $$\ge$$ 3, x $$\le$$ 9, y $$\ge$$ 0

x $$-$$ y $$\ge$$ 0, x + y $$\le$$ 14

The feasible region has
A
5 corner points including (0, 0) and (9, 5)
B
5 corner points including (7, 7) and (3, 3)
C
5 corner points including (14, 0) and (9, 0)
D
5 corner points including (3, 6) and (9, 5)
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